The variable region of an antibody occurs
A. only on the heavy chains.
B. only on the light chains.
C. on one of the light chains.
D.
on all four chains.
D
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A hypothetical family of proteins consists of six similar but different proteins. Each of the six proteins can form transcription factors by forming homo- or heterodimers in combinatorial mixtures, each binding to different regulatory sites
Calculate the number of different dimeric structures that can be formed from the six proteins (and, thus, potential number of different regulatory sites that can be bound).
In the natural population of black widowbirds, there is some variation in tail length. Tail
length is an inherited trait; the versions of this trait that result in different lengths are called __________.
a. genomes b. adaptations c. phenotypes d. alleles
Natural selection is a quick and effective way of eliminating harmful alleles from the population
a. True b. False
When cells stop responding to normal controls over
growth and division they a. begin to form a tumor. b. produce a malignancy. c. start to die. d. kill surrounding cells. e. produce scar tissue.